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y in (-oo:+oo)
9/10 = -y/5 // + -y/5
9/10-(-y/5) = 0
(1/5)*y+9/10 = 0
1/5*y+9/10 = 0 // - 9/10
1/5*y = -9/10 // : 1/5
y = -9/10/1/5
y = -9/2
y = -9/2
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